avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/doc/device-tree-bindings/exynos/dwmmc.txt

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+* Exynos DWC_mobile_storage
+
+The Exynos provides DWC_mobile_storage interface which supports
+. Embedded Multimedia Cards (EMMC-version 4.5)
+. Secure Digital memory (SD mem-version 2.0)
+. Secure Digital I/O (SDIO-version 3.0)
+. Consumer Electronics Advanced Transport Architecture (CE-ATA-version 1.1)
+
+The Exynos DWC_mobile_storage provides four channels.
+SOC specific and Board specific properties are channel specific.
+
+Required SoC Specific Properties:
+
+- compatible: should be
+	- samsung,exynos-dwmmc: for exynos platforms
+
+- reg: physical base address of the controller and length of memory mapped
+	region.
+
+- interrupts: The interrupt number to the cpu.
+
+Required Board Specific Properties:
+
+- #address-cells: should be 1.
+- #size-cells: should be 0.
+- samsung,bus-width: The width of the bus used to interface the devices
+	supported by DWC_mobile_storage (SD-MMC/EMMC/SDIO).
+	. Typically the bus width is 4 or 8.
+- samsung,timing: The timing values to be written into the
+	Drv/sample clock selection register of corresponding channel.
+	. It is comprised of 3 values corresponding to the 3 fileds
+	  'SelClk_sample', 'SelClk_drv' and 'DIVRATIO' of CLKSEL register.
+	. SelClk_sample: Select sample clock among 8 shifted clocks.
+	. SelClk_drv: Select drv clock among 8 shifted clocks.
+	. DIVRATIO: Clock Divide ratio select.
+	. The above 3 values are used by the clock phase shifter.
+
+Example:
+
+mmc@12200000 {
+	samsung,bus-width = <8>;
+	samsung,timing = <1 3 3>;
+	samsung,removable = <1>;
+}
+In the above example,
+	. The bus width is 8
+	. Timing is comprised of 3 values as explained below
+		1 - SelClk_sample
+		3 - SelClk_drv
+		3 - DIVRATIO
+	. The 'removable' flag indicates whether the the particilar device
+	  cannot be removed (always present) or it is a removable device.
+		1 - Indicates that the device is removable.
+		0 - Indicates that the device cannot be removed.

u-boot/doc/device-tree-bindings/exynos/emmc-reset.txt

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+* Samsung eMMC reset
+
+Some exynos boards require special handling of nRESET_OUT line for eMMC memory
+to perform complete reboot.
+
+Required properties:
+- compatible: should be "samsung,emmc-reset"
+- reset-gpio: gpio chip for eMMC reset.
+
+Example:
+
+emmc-reset {
+        compatible = "samsung,emmc-reset";
+        reset-gpio = <&gpk1 2 0>;
+};

u-boot/doc/device-tree-bindings/exynos/isp-spi.txt

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+Exynos ISP SPI Subsystem
+
+The device node for ISP SPI subsytem.
+Since Peripheral id in EXYNOS is decoded based on Interrupts, currently
+ISP SPI have no individual interrupts hence we add ad dummy interrupt node
+which will have a value beyond the maximum number of interrupts exynos5 can
+support.
+
+Required properties :
+ - compatible : Should be "samsung,exynos-spi" for spi.
+ - reg : Base adrress of the the subsystem.
+ - interrupts : A value which is beyond the maximum number of interrupts
+exynos5 can support.
+
+Example:
+spi@131a0000 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	compatible = "samsung,exynos-spi";
+	reg = <0x131a0000 0x30>;
+	interrupts = <0 129 0>;
+};

u-boot/doc/device-tree-bindings/exynos/soc.txt

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+Exynos SoC model
+
+The "cpu-model" property is a non-standard extension for the device tree root
+node. Since the cpu id of some Exynos variants does not correspond to product
+name, this property fills the gap.
+
+For almost all Exynos based boards in the kernel, the product name corresponds
+to the device tree file name. The same name is generated in U-Boot, so the new
+property allows doing it automatically.
+
+Required properties:
+ - cpu-model : Exynos product name
+
+Example:
+
+/ {
+	model = "Samsung/Google Peach Pi board based on Exynos5800";
+	cpu-model = "Exynos5800";
+
+	compatible = ...
+};

u-boot/doc/device-tree-bindings/exynos/sound.txt

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+Exynos Sound Subsystem
+
+The device node for sound subsytem which contains codec and i2s block
+that is a part of Exynos5250
+
+Required properties :
+ - compatible : Should be "samsung,exynos-sound" for sound
+ - samsung,i2s-epll-clock-frequency : epll clock output frequency in Hz
+ - samsung,i2s-sampling-rate : sampling rate, default is 48000
+ - samsung,i2s-bits-per-sample : sample width, defalut is 16 bit
+ - samsung,i2s-channels : nummber of channels, default is 2
+ - samsung,i2s-lr-clk-framesize : lr clock frame size
+ - samsung,i2s-bit-clk-framesize : bit clock frame size
+ - samsung,codec-type : sound codec type
+
+Example:
+
+sound@12d60000 {
+	compatible = "samsung,exynos-sound"
+	samsung,i2s-epll-clock-frequency = <192000000>;
+	samsung,i2s-sampling-rate = <48000>;
+	samsung,i2s-bits-per-sample = <16>;
+	samsung,i2s-channels = <2>;
+	samsung,i2s-lr-clk-framesize = <256>;
+	samsung,i2s-bit-clk-framesize = <32>;
+	samsung,codec-type = "wm8994";
+};

u-boot/doc/device-tree-bindings/exynos/tmu.txt

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+Exynos Thermal management Unit
+
+Required properties:
+
+ - compatible : Should be "samsung,exynos-tmu" for TMU
+ - samsung,min-temp : Minimum temperature value (25 degree celsius)
+	- Current temperature of SoC should be more than this value.
+ - samsung,max-temp : Maximum temperature value (125 degree celsius)
+	- Current temperature of SoC should be less than this value.
+ - samsung,start-warning : Temperature at which TMU starts giving warning (degree celsius)
+ - samsung,start-tripping : Temperature at which TMU shuts down the system (degree celsius)
+ - samsung,hw-tripping : Temperature at which hardware tripping should happen
+	in case TMU fails to power off (degree celsius)
+ - samsung,efuse-min-value : SOC efuse min value (Constant 40)
+	- efuse-value should be more than this value.
+ - samsung,efuse-value : SOC actual efuse value (Literal value)
+	- This is the data trimming info.
+	- This value is used to calculate measuring error.
+ - samsung,efuse-max-value : SoC max efuse value (Constant 100)
+	- efuse-value should be less than this value.
+ - samsung,slope : Default value 274761730 (Constant 0x1060_8802).
+	- This is the default value for TMU_CONTROL register.
+	- It sets the gain of amplifier to the positive-tc generator block.
+	- It selects thermal tripping mode and enables thermal tripping.
+ - samsung,dc-value : Measured data calibration value (Constant 25)
+	- Used for tempearture calculation.
+	- This is 25 because temperature measured is always above 25 degrees.
+
+
+Example:
+
+tmu@10060000 {
+	compatible = "samsung,exynos-tmu"
+	samsung,min-temp = <25>;
+	samsung,max-temp = <125>;
+	samsung,start-warning = <95>;
+	samsung,start-tripping = <105>;
+	samsung,hw-tripping = <110>;
+	samsung,efuse-min-value = <40>;
+	samsung,efuse-value = <55>;
+	samsung,efuse-max-value = <100>;
+	samsung,slope = <274761730>;
+	samsung,dc-value = <25>;
+};